Avoiding contact with these wires is very important. If necessary, run a new circuit to serve the need of all your appliances. In a 240-volt circuit there is no neutral wire. The side that comes through the bottom should have spiral edges for screwing it in. Remove knockout plates from your cover as needed. In fact, most people choose not to do it themselves out of fear of being shocked.
You want to keep the wiring dedicated to the need of the generator since its purpose is for additional or emergency power. However, the screws are the preferred method as they provide a better contact between the wires and the outlet. Sometimes in some panels you may have a set of 4 breakers molded together and they mount in the panel over the 2 lugs , the middle 2 breakers would be the 2 30 amp breakers and the outer 2 could be 15 or 20 amp breakers for use in general purpose 110 v circuits. Finally, rescrew the cover onto the panel. After I replaced all the wiring in my first house, I was comfortable with digging into a circuit breaker box.
I have seen 240 volt service entrance wires short together during a windstorm and the sparks are spectacular. This device is essential in a modern world that runs on electricity. Please note, electrical panels are dangerous to work in, never touch any of the main bus lugs in the panel, they can kill! Doing this provides a significantly superior connection compared to back-wiring, and most electricians use this technique on their own houses because of it. Once attached, pivot the circuit breaker on the mechanical contact and roll towards the center of the panel - making sure the bus bar of the panel is still aligned with the slot or opening on the circuit breaker case. Connect the white wire to neutral bus-bar. I have never seen an electrician use any type of torque measuring device when installing electrical equipment. The wire should go nearly the full 1.
Remove two knockout tabs for the new double-pole breaker, if necessary. In the example in the picture the dryer doesn't have color designation on the wires, follow direction above; if the dryer cord does have colored wires, white is the neutral wire to the center connector, the red and black wires are the hot live wires which connect to the 2 outer connections of the dryer terminal block, don't forget the ground strap or green wire jumper from the center connector to the dryer frame. This sounds as if it is the case in your existing dryer. This is a vital step for repairing things electrical or even changing fuses. Viewed from the back, the lower right-hand screw takes the black, hot wire; the lower left-hand screw takes the white, neutral wire; the upper screw takes the green sometimes bare , ground wire.
Solid Wire One more thing to keep in mind is to select the style of wire that best fits your needs. Each double-pole breaker connects to both of the bus bars thus providing 240 volts between hot wires. Make sure you use a test light or meter to verify that the power is off since it's dangerous to install a circuit breaker in a panel that still has power. The bare wire should also be grounded to the electrical box if metallic. Use a 30 amp 240 volt double pole breaker in the panel.
Attach a cable clamp through the hole. Each double-pole breaker connects to both of the bus bars thus providing 240 volts between hot wires. Just look where all the other white wires are going in your panel. But an evaluation and replacement with copper wiring may be a good idea. Note the metal bus bar. Turn off the breaker before plugging the item back in, and then reset, because if you have a short circuit in a device you can get a high inrush of current that can arc severely, possibly burning you or worse.
Operate 220 volt equipment from standard 110-120 volt outlets. Aluminum wiring was once widely used, but because it was found that aluminum had a greater expansion profile under load, it often loosened wire connections and sometimes caused electrical fires. This is a good technique for house wiring, although it does cost a little more. Paul, from Foxboro, Massachusetts I wish I found this site earlier, it is by far the best electrical related resource I have found on the web. Note: Be sure to disconnect the ground wire or strap that runs from the center terminal to the case. The center wire neutral wire of the cable goes to the center connector.
To be even safer you can switch the main breaker off to de-activate the panel which installing the breaker, use a second person to help with a flashlight if needed. Note the center hole is not a terminal. If you are going from an appliance that required 30 amps and your new appliance requires only 20 amps, the wire does not need to be changed. Attach the green wire to the common ground block. No ground strap is used in a 4 wire setup grounded circuit.
Tools Required: Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter. On the back there is a label stating that the dryer is 'neutrally grounded' and I notice that the existing three prong plug only hooks up to the two hots and a neutral in the back of the dryer. And then I cut away the jacket, all the way back to the cable clamp. The red and black wires are hot live wires and get connected to the 2 outer connectors on the dryers power terminal block, doesn't matter which is which as long as it is the outer two connectors. If you have wire strippers, simply clamp the insulated wire in the slot that matches the size of your wire, turn the strippers half a turn to score the insulation, and pull the wire through.
Use a test light or meter set to check for the presence of power. But be warned, there is a correct amount of tightening, and it's quite firm. It is best to close the panel back up and hire a professional electrician to advise you on it or do the work. I removed the last knock-out from the panel cover, using a pair of Channel-Lock pliers. Read the installation instructions for your combination switch carefully to see if there are any additional steps or precautions you should take. Touching these wires would require a lot of carelessness. My only fear is accidentally touching the live metal parts with the wire I'm working on, possibly causing a short and a big nasty arc.